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Direction and scale

This is something that I personaly struggle with the most, that is how to know the direction and scale in my drawing.

How do you know when a line is perpendicular to another in 3d space? Given which way the front is, how do you know which way is right/left,up/down? Given a unit of length in one direction, how do you know the length of the same unit in another direction, despite foreshortening?

I realize practice makes perfect but you know what makes perfect faster? Knowing how to practice. So any tips are more than welcome